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Zebra Mussel shells

wall of zebra mussels that has drifted onto the shore of Green Bay.
The Zebra Mussel shells in this photo are mostly 2 to 3 feet deep along the Green Bay shoreline on UW Green Bay's Cofrin Arboretum. The empty shells accumulate in this way only in certain areas, apparently due to circulation patterns in the bay. It is not difficult to imagine that they have a strong direct influence on the ability of other animals and plants to live on these sites, in addition to their effect on the aquatic system when they are alive.